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Accounts Receivable
3 Months Ended
Aug. 31, 2021
Accounts Receivable  
Accounts Receivable

Note 5 – Accounts Receivable

Financial instruments that potentially subject us to concentrations of market or credit risk consist principally of trade receivables. While our trade receivables are diverse and represent a number of entities and geographic regions, the majority are with the U.S. government and its contractors and entities in the aviation industry. The composition of our accounts receivable is as follows:

August 31, 

May 31, 

    

2021

    

2021

U.S. Government contracts:

 

  

 

  

Trade receivables

$

23.0

$

24.1

Unbilled receivables

 

21.2

 

25.2

 

44.2

 

49.3

All other customers:

 

 

  

Trade receivables

 

120.5

 

104.9

Unbilled receivables

 

16.1

 

12.5

 

136.6

 

117.4

$

180.8

$

166.7

We currently have past due accounts receivable owed by former commercial program customers primarily related to our exit from customer contracts in certain geographies, including Colombia and Peru. Our past due accounts receivable owed by these customers was $2.2 million as of August 31, 2021, which was net of allowance for doubtful accounts of $5.0 million.